Daimler Chrysler Ag

Mercedes-benz Aktiengesellschaft

Reinhold Schob

Gerhard Kurz

Armin Muller

Harry Troster

Gerd Eilert

Volker Maass

Thomas Rohrig-Gericke

Bernd Scharnowski

In a method for braking a motor vehicle at low speeds in order to avoid a collision with an obstacle in its immediate vicinity, the distance and the relative speed between the vehicle and the obstacle are determined by sensor and are based on the calculation of a necessary braking pressure or a deceleration. The brake pressure is generated at least partially independently of the driver. In order to minimize the reaction time in the case of slow approach to an obstacle in the case where the relative speed falls below a threshold value and the distance falls below a proximity limit, the braking torque is set to a smaller value than the engine torque. In the case where the distance falls below a stop limit, which is smaller than the proximity limit, the braking torque and the engine torque are adjusted in such a way that the braking torque exceeds the engine torque.

Method and appliance for braking a motor vehicle in the immediate vicinity of an obstacle

An improved method is used to determine speed variation between wheels of different axles of a vehicle. The difference between the speeds of the rear wheels and the speeds of the front wheels is formed, and a correction is determined which compensates for the variations between the speeds of the front wheels and the rear wheels arising because of the vehicle geometry. The speed variation between the wheels of different axles of a vehicle is given by the difference plus the correction and, under particular driving conditions, which are characterized at least in that the acceleration of the rear wheels is below a threshold value at which there is no speed difference between the wheels of different axles because of drive slip, an adaptation of the correction takes place by determining the difference between the speeds of the rear wheels and the front wheels and by adapting the correction in such a way that the correction, under the particular driving conditions, is equal with respect to magnitude to the difference between the speeds of the rear wheels and the front wheels and exhibits a change of sign relative to this difference. In addition, or alternatively, in determining the correction, the vehicle transverse acceleration is taken into account by the magnitude of the correction becoming smaller with increasing transverse acceleration.

Method for determining the speed variation between wheels of different

Growing community of inventors

Gaufelden, Germany

Reinhold Schob